few weeks I have sold my Arduino Uno and bought a Mega 2560 instead (my projects were growing up and there were not enough digital pins for me ). Now I am getting first experiences with Mega and its capabilities/differences compared to Uno.

BUT If I use his demo code (ready to download on item page) it simply doesnt work. Says that init of SD card failed. When I gathered informations about SD card pins, found out that there are different connections on Mega boards (compared to Uno boards). Also found that on some these lcd shields sellers are noticing that on Mega`s SD doesnt work....

Also tried simple SD card example from Arduino IDE, with no luck...

Any ideas what to try next / or where could be problem ? I want to write him that this shield is not fully Mega compatible, but want to ensure that I am not doing anything bad....

If the LCD uses SPI too then both devices will share the MOSI, MISO and SCK pins but then have a SS pin each. Hardware SS is usually pin 10, so that is probably your pin 54 equivalent on Mega.

SD Card tends to be pin 4 for SS.

Note that you can often configure the SS pins in the libraries though, so you could check if they state D10 and D4 and leave them as is. You'd just need to get the 3 SPI pins to the correct Mega ones then.

Yes, you are completely right Unfortunately the modding the libs can be only possible if desired pins are not required by other devices which is sadly my case... But probably I will sell this shield and buy another display module. But spotted that ST7735 is slow for my needs - posted a question in newly posted thread by another user - it has suitable topic name for my question

Its test of the same LCD (but in non shield version) running the demo code on Leonardo (? - not sure it it is Leonardo ) As in this comparison the LCD in SPI works much faster than in "simple connection" (?GPIO). Mine display shield is behaving same slow, as on "simple connection". Ran the exactly same code as in video.Could it mean, that if I use other pins than SPI marked on Mega that it causes the slow because general digital pins has slower data output rates than serial marked ones?

They are just normal pins, that's why there is no difference in speed.

The SPI on Mega2560 is on 50,51,52 and the ICSP header. 53 is hardware SS.

Sorry, but didnt you thought that there IS a difference in speed?

And I am using these pins on Mega with sample code and it "works" , but there is described slowness in speed of redrawing... Might these be solved with soldering a wires and reconnect it on above pins you spoke about?